ReactJS 19: The Significant Parts
The biggest improvements in ReactJS 19 have been made with Concurrent Mode, which not only keeps the UI smooth and responsive while your application updates itself but also ensures a seamless interface especially at complex transitions such as animations.
Following the lead of Python, in ReactJS 19 Server Components were further advanced with improved support and tooling to architect reliable and performant server-rendered components.
Changes to state/props are now automatically batched across asynchronicity events, reducing re-renders and generally speaking perform a lot better with much less need on the developers side.
The previous version the opened up JSX Transform also got several updates bringing better TypeScript and modern JavaScript tooling integration, along with bundle size reduction and build improvements.
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